169 

 Jewett: Plecoptera 



J 



SUPRA-ANAL PROCCS 



Fig. 6:27, Female terminalia of Leucfra, in ventral view. 

 a, sara; b, occidentalis; c, infuscata (Needhom and Claassen, 

 1925). 



hooked (fig. 6:26/); female subgenital plate extending 

 little beyond the 8th sternite (fig. 6:276); southern 



British Columbia to California and Utah 



(synonyms: bradleyi Claassen 



1923; projecta Frison 1942). .. occidentalis Banks 1907 



— Titillator of male without bulbous tip; female subgenital 

 plate extending about its own length beyond the 8th 

 sternite 6 



6. The upper prong of the male cercus longer than the' 

 lower and with a small tooth on the inner margin (figs. 

 6:26e; 6:27a); southern British Columbia to California 

 and Colorado sara Claassen 1937 



— The two prongs of the male cercus widely spaced and 

 of about equal length (fig. 6:26c); Washington and 

 Montana to California forcipata Frison 1937 



Key to the Known Nymphs of California 



Species of Leuctra 6 



I 1. Body nearly naked (legs moderately hairy); femora of 



the hind legs unusually large 



L. (Despaxia) augusta Banks 1907 



hBody at least moderately hairy; hind femora normal 

 2 



2. Body moderately hairy; abdominal tergites with a band 

 of unusually long hairs on either side, about a third of 



the way from the anterior margin 



L. (Paraleuctra) occidentalis Banks 1907 



— Body very hairy; longest dorsal abdominal hairs near 



the hind margin of each segment 



L. (Moselia) infuscata Claassen 1923 



Subfamily CAPNIINAE 



This family is Holarctic in distribution and is repre- 

 sented in North America by six genera, three of which 

 occur in California. The genus Eucapnopsis Okamoto 

 1922 is represented in California by brevicauda (Claas- 

 sen) 1924 (fig. 6:28a, 6) which ranges from British 

 Columbia and Montana to California. Two described 

 species of the genus Jsocapnia Banks 1938 occur in 

 the state. /. grandis (Banks) 1908 (synonyms: C. fumi- 

 gata Claassen 1937 and /. fumosa Banks 1938) is a 

 large species with a body length of more than 10 mm. 

 /. abbreviate! Frison 1942 is a much smaller species 

 with a body length of less than 8 mm., and the supra- 

 anal process of the male (fig. 6:29a) is very much 

 shorter than the long one of /. grandis (fig. 6:296). 

 More than thirty species of Capnia Pictet 1841, have 



'From Ricker (1943). 



'mmmmh 



Fig. 6:28. Eucapnopsis brevicauda, a, ventral view of female 

 terminalia; b, lateral view of male terminalia (Frison, 1937). 



been described from North America; the males of 

 those known to occur in California are keyed below. 

 Lack of knowledge concerning the females and nymphs 

 precludes the construction of keys for these. 



Key to Males of California Species of Capnia 

 (Male of C. bakerl (Banks) 1918 unknown)' 



1. Ninth sternite with a ventral appendage; wings spotted; 

 central California (fig. 6:53c) . . . .maculata Jewett 1954 



— Ninth sternite without a ventral appendage; wings not 

 spotted but may be banded 2 



2. Supra-anal process slender, completely divided into a 

 dorsal and a ventral part 3 



— Supra-anal process not both slender and divided .... 4 



3. A pair of spinous processes present on tergites 8 and 9 

 (fig. 6:30A); southern California 



spinulosa Claassen 1937 



— No process on tergites 8 and 9 (fig. 6:30a); British 

 Columbia to Oregon columbiana Claassen 1924 



4. Supra-anal process rather broad and divided into a 

 longer ventral process and a shorter dorsal process 

 (fig. 6:306); Plumas County, California 



barberi Claassen 1924 



— Supra-anal process not divided, often slender 5 



5. Supra-anal process much expanded at the middle, about 

 half as wide as long 6 



— Supra-anal process slender and tapered, or if expanded, 

 the greatest width less than a third of the total length 



9 



6. Ninth tergite with raised knobs on either side of the 

 mid-line 7 



— Ninth tergite without knobs 8 



7. Seventh tergite with a median tubercle overhanging the 

 8th (fig. 6:30c); southern California; Yosemite National 



Fig. 6:29. Male terminalia of / socapnia. a, abreviata, dorsal 

 view; b, grandis, lateral view (Frison, 1942a). 



'Adapted from Ricker (1943). 



